Reverse Engineering Printed Circuit Board for Signal Integrity

Reverse Engineering Printed Circuit Board for Signal Integrity can solve the issue after modify the circuitry pattern of original PC board, especially happens in the high speed electronic PCB card redesign drawing include schematic and gerber file;

Signal Integrity is a very important issue in the process of reverse engineering PCB, which means the signals transmission quality on the circuit conductor of printed circuit board, and if they can be convey in correct time sequence and voltage response ability.

If the signal inside the printed circuit board circuit can reach the receiver in required time sequence, lasted time cycle and voltage range, then the engineer can assure the signal integrity is performed well. On the contrary, if the signal fails to response normally, it will reflect the signal integrity issue.

Signal integrity issues from High Speed printed circuit board include signals reflection, cross-talk, signal delay and time sequence in-correction.

Crosstalk: in the process of PCBA duplication, crosstalk means when the signals transmitting on the line, the mutual capacitance and resistance of decoupling because of electro-magnetic energy to generate unexpected noise interference on the transmitting line, it was generated through the mutual interaction within the same area with different structure electro-magnetic fields. Mutual capacitance can generate decoupling current which is called capacitance crosstalk and mutual capacitance will give rise to decoupling voltage, which call capacitive crosstalk. On the printed circuit board, crosstalk has relations with track length, signal line space, as well as reference level.

Signal delay and time sequence mistake: signals transmitting on the printed circuit board line with limited speed, signals send out from the driving terminal and reach the receiving terminal, and there is a transmission delay in the process. Too much signal delay or signal delay mismatching can probably cause the time sequence mistaken or logic components malfunctionality.

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